In addition to the song linked to the Bodleian Library by pavane, I have found at least six other frames in that Library with the lyrics substantially as found in the link to the CELTIC LYRICS provided by nutty. I could not find any dates of publication for those entries. The significance of this I leave to others to debate.

However, if my recollection of history is correct, Sarsfield was one of the leaders of the Uprisings of 1798, and that he fled Ireland after the defeat of the Irish. The Fenian Uprising, on the other hand, did not occur until about 1867. This would suggest that the song the lyrics to which pavane found in the Bodleian library, which reference the Fenian men is not necessarily earlier in time than the song attributed to Michael Scanlan.